(define (add a b)
  (+ a b))

(define (subtract a b)
  (- a b))

(define (multiply a b)
  (* a b))

(define (divide a b)
  (/ a b))

(display (add 5 3))
(newline)
(display (subtract 5 3))
(newline)
(display (multiply 5 3))
(newline)
(display (divide 6 3))
(newline)

;;;;